An electroaffinity labelling platform for chemoproteomic-based target identification

Target identification involves deconvoluting the protein target of a pharmacologically active, small-molecule ligand, a process that is critical for early drug discovery yet technically challenging. Photoaffinity labelling strategies have become the benchmark for small-molecule target deconvolution, but covalent protein capture requires the use of high-energy ultraviolet light, which can complicate downstream target identification. Thus, there is a strong demand for alternative technologies that allow for controlled activation of chemical probes to covalently label their protein target. Here we introduce an electroaffinity labelling platform that leverages the use of a small, redox-active diazetidinone functional group to enable chemoproteomic-based target identification of pharmacophores within live cell environments. The underlying discovery to enable this platform is that the diazetidinone can be electrochemically oxidized to reveal a reactive intermediate useful for covalent modification of proteins. This work demonstrates the electrochemical platform to be a functional tool for drug-target identification.

Automated summary

Target identification is crucial for early drug discovery but technically challenging. Photoaffinity labelling is commonly used but has limitations. Here, we introduce an electroaffinity labelling platform using a redox-active diazetidinone functional group for chemoproteomic-based target identification in live cells. This work demonstrates the effectiveness of the electrochemical platform for drug-target identification.